Myntra.com — wrong product delivered by myntra

Address: Chennai, Tamil Nadu, 600037

This is regarding order no:[protected]-5318603 (Black solid leap backpack-wildcraft) ordered on 19th august.
Instead of the above mentioned product a different product was delivered, when trying to ask for a replacement no proper response was given even after sending a mail and contacting myntra. It's been a week since and still no proper action has been taken, however the full payment for the item was made. Kindly respond and do the necessary.